Texted my ex and now I’m getting 0 hours of sleep?

My ex betrayed me beginning of the year. After finally realizing I feel better taking space from them, and on and off..I went a week of no contact and slept perfectly but reached out last Friday..I feel like my body is on hypervigilant mode now.. I thought if I just text them that could work instead of seeing them. I noticed I wasn’t sleeping at all at night. After two nights of no sleep. I told them I needed space again to heal and get better. Now last night I got no sleep again. Literally..0 hours. I’m just looking for some reassurance because I thought texting them would be fine, but they started saying some guilt tripping things to me again..and I feel like now my body is hypervigilant.